<div class="container"></div>

<style>
/* From Uiverse.io by Deri-Kurniawan  - Tags: simple, material design, pattern */
.container {
  width: 100%;
  height: 100%;
  background: radial-gradient(circle at 10% 10%, #3e73f0 5%, transparent 5%),
    radial-gradient(circle at 90% 10%, #3e73f0 5%, transparent 5%),
    radial-gradient(circle at 90% 90%, #3e73f0 5%, transparent 5%),
    radial-gradient(circle at 10% 90%, #3e73f0 5%, transparent 5%);
  background-size: 20px 20px;
  box-shadow: 0 0 10px rgba(0, 0, 0, 0.3);
}

</style>
    